Power drill



Aug. 6, 1940. E. MANTINI 2,210,628

' POWER DRILL Filed June 1.3, 1939 INVENTOR Eugenio J7 laniznz,

/ ATTORNEYS WITNESSES Patented Aug. 6, 1940 UNITED STATES 1 Claim.

This invention relates to an improved power drill and has for an objectto provide a construction of power drill which is particularly adaptedfor mining, the parts being so arranged that they may be adjusted totake care of different conditions met with during mining operations.

Another object of the invention is to provide a power drill wherein thedrill and driving means are adjustably mounted.

' Another object of the invention is to provide a power drill having anadjustable mounting capable of engaging the bottom and ceiling of a mineor capable of being held in place by auxiliary means where the ceilingis of unusual height.

In the accompanying drawing- Fig. 1 is a vertical sectional view throughpart of a mine and an embodiment of the invention;

Fig. 2 is an enlarged sectional view through Fig. 1 approximately on theline 22;

Fig. 3 is a fragmentary view showing an auxiliary support for the mainsupporting standard illustrated in Fig. 1.

Referring to the accompanying drawing by numerals, l indicates a wall ofcoal or other material which is adapted to be mined. In mining orremoving the wall I, it is customary to drill one or more holes thereinand then to place an explosive in the holes to break down sections ofthe wall. In the present invention a power drill has been provided fordrilling holes in the wall I.

As shown in Fig. 1, a drill 2 has been driven a short distance into thewall I by the mechanism embodying the invention. It will be understoodthat the drill 2 is a conventional drill and may be of any desired kind.The drill 2 is connected with a rotating threaded shaft 3 by a coupling6 which is preferably permanently connected with shaft 3 and removablycoupled to the end of drill 2. The end 5 of shaft 3 may be removablycoupled to the coupling member 6 connected with a reducing gearstructure l of any desired kind.

The reducing gear structure is actuated by an electric motor 8 designedto receive current from any suitable supply. When motor 3 is operating,shaft 3 will be rotated and in turn will rotate drill 2. In order tofeed the shaft 3 forwardly, a nut e is provided. This nut is formed intwo parts, as shown in Fig. 2, namely, parts l0 and l l. The part H! isprovided with a threaded sec-- tion l2 and with journal members I2 andId journaled in a U-shaped bracket l4 supported by a short stem 16welded or otherwise rigidly secured to a cross bar I! forming part of aframe 18. The frame 18 is preferably U-shaped and is (El. 255--2iilformed of angle irons l9 except for the respective cross bars ll, whichcross bars are preferably welded in place. llhe part I l of hat 9 ispivotally mounted at 2i! and is provided with a threaded section 2!coacting with the threaded section i2 for receiving the shaft 3. A slot22 is formed in part Ii and through this slot a post 23 rigidly securedto part Iii extends. A pin 24 is removably mounted in the free end ofthe post 23 and normally acts to hold part II in functioning position asshown in Fig. 2.

As the motor 8 continues to rotate shaft 3, said shaft will not onlyrotate drill 2 but will move the same to the left, as shown in Fig. 1,until the coupling 6 contacts with the nut 9, whereupon current isturned off manually so as to prevent injury to the device. If a deeperbore is necessary the drill 2 is removed and a longer drill substitutedand during this time part I l is swung to an open position and shaft 3and motor 8 manually moved back to substantially the position shown inFig. 1. A second operation of the shaft 3 will cause the new drill tofunction.

In order to hold the frame iii in place and, consequently, cause theother parts to function properly there are provided a rectangularstandard 25 near nut 9 and preferably a single post 26 at the oppositeend of the frame l8. Post 26 is provided with an enlarged foot 2'! andwith a number of apertures 28 through which a pin 29 is adapted to bemoved at different times. A

tubular sleeve 30 is welded or otherwise rigidly secured to an angle barl9 at the end of frame 18 and post 26 slidingly extends through thistubular member. This tubular sleeve 30 is provided with apertures foraccommodating the pin 29 so that this end of the frame l8 may be raisedor lowered to secure any desired angle of the drill 2. Atthe front theframe [8 is provided with rows of apertures 31 for accommodating a pin32 whereby the front of the frame may be raised or lowered as desired.It will be noted that each vertical leg of frame 25 is provided with arow of apertures 3| and the pin or bolt 32 extends through both legs. asillustrated in Fig. 2. A single post 33 is connected to the bottom ofthe standard 25, said post having an enlarged foot 3d adapted to rest onthe floor 35. At the top of the standard 25, there is provided athreaded member 36 for receiving the internally threaded tube 37 havinga pointed pin 38 extending from the upper end.

When the various parts are adjusted to substantially the desiredposition, a wrench is applied to the tubular member 31 and this memberis rotated until the pin or threaded extension 38 tightly pressesagainst the top 39. This firmly anchors the top in place so that asmotor 8 functions the drill may readily be forced into the wall I.Concerning motor 8, it will be seen from Fig. 1 that the same isprovided with rollers 40 resting on the side angle bars l9, wherebyfriction is reduced to a minimum. Occasionally the top or roof 39 is attoo great a distance from the bottom 35 for the standard 25 to functionproperly and when this is the case an auxiliary top is provided by usinga metal bar 4| which is driven into wall i and which is provided with anaperture 42 for receiving the reduced end 38 of the member 31. In thisway the device may be anchored near wall I regardless of the height ofthe top 39.

In driving the threaded shaft 3 any suitable power may be used, as forinstance an electric motor 8 as illustrated in Fig. 1. Where compressedair is available a compressed air engine may be used to rotate shaft 3,or, if preferred, a flexible shaft may be used, said shaft being drivenby any suitable power from a distant point.

I claim:

A power drill including a rectangular frame having a pair of parallelside bars L-shaped in cross section, an adjustable standard at one endof said frame for adjustably supporting said end, a second adjustablestandard at the opposite end of said frame, said second standard beingformed with a pair of spaced parallel uprights, a connecting bar at eachend of said uprights, said parallel uprights each being provided with arow of apertures, a pin adapted to be placed in any of said apertures insaid uprights, said pin extending through said side bars for supportingsaid frame, a supporting foot connected to one of the connecting bars, athreaded member extending from the other of said connecting bars, atubular member screwed on to said threaded member, said tubular memberhaving a pointed anchoring projection, a nut carried by said frame nearsaid pin, a screw extending through said nut, means at one end of saidscrew for connecting a drill to said screw, and a prime mover connectedto the other end of said screw for rotating the same, said prime moverbeing provided with traction members resting on one leg of each of saidL-shaped bars, said frame and said screw being swingable upwardly anddownwardly in said second standard for providing a desired angle forsaid screw and the drill carried thereby.

EUGEN'IO MANTINI.

